can I use the original amount of 10 shares @24. of $240 as the cost value. Over the years there have been multiple mergers(bank stock) that just issued new stock. At time of sale there was only 9 shares and paid $5.00 per 9 shares of $45.00. they issued a 1099 b with sale of 9 shares for $45.00. The cost basis is blank. Since I know the amount of the original purchase can I use that for a loss?
